a caballo
| on horseback |
de boca en boca
| by word of mouth |
a fuerza de
| by dint of |
a pie
| on foot |
por correo electrónico
| by e-mail |
por barco
| by boat |
en bicicleta
| by bike |
en autobús
| by bus |
por computadora
| by computer |
por escrito
| in writing |
por ferrocaril
| by train |
por teléfono
| by phone |
en coche
| by car |
por avión
| by plane |
por correo
| by mail |
por fax
| by fax |
por medio de
| by means of |
|
Spelling and Pronunciation
Idiomatic Expressions 
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